Apparently Tiger Woods has been keeping Rory McIlroy and his fiancée Erica Stoll up late at night.

(Photo by Kevin C. Cox/Getty Images)

In a recent interview with The Independent published Sunday, Rory McIlroy revealed some of the details behind he and Tiger Woods relationship, and one in particular that his fiancée doesn’t approve of.

“He’s an intriguing character because you could spend two hours in his company and see four different sides to him,” McIlroy said of his fellow golfer. “When he’s comfortable and he trusts you — and his trust [sensitivity] is way [higher] than mine — he’s great.”

(Photo credit: REUTERS/Matt Sullivan)

“He’s thoughtful. He’s smart. He reads. He can’t sleep so that’s all he does,” McIlroy continued. “But he struggles to sleep, which I think is an effect of overtraining, so I tell him to calm down sometimes. He’d be texting me at four o’clock in the morning: ‘Up lifting. What are you doing?'”